Somerset will stay up if they beat Middlesex
Middlesex down if they lose & Hampshire win or draw
Hampshire out for 116 at Edgbaston
Hants relegated if they lose & Somerset win
Worcs promoted if they take 9 Durham wickets inside 110 overs
Northants & Notts also chasing promotion
Leicestershire 128 v Northants 90-1
Northants lose their first wicket at Grace Road.
Rob Newton edges Ben Raine behind, but they're still in the driving seat.
The deficit is just 38.
Warwickshire 188 v Hampshire 28-3
George Bailey (11 not out) and Sean Ervine (6 not out) have stopped the rot and are attempting to rebuilds Hampshire's innings.
Four more points from this match, however they come, are what Hampshire require to stay in Division One for next season.
Somerset 236 & 97-3 v Middlesex 142
Somerset captain Tom Abell has 11 off 54 deliveries.
But it's the perfect tempo in these tricky batting conditions.
There might be a bit of rain about tomorrow afternoon in Taunton, but Thursday is looking fine all day.
The lead currently stands at 193.
Image source, Rex FeaturesWorcestershire 335 v Durham 12-1
One down, eight to go for Worcestershire.
Keaton Jennings nicks Josh Tongue behind while attempting a cut shot and Ben Cox does the rest behind the stumps.
If Worcestershire take nine Durham wickets inside 110 overs, they go up to Division One.
Somerset 236 & 93-3 v Middlesex 142
Anthony Gibson
BBC Somerset
The odd balls are misbehaving but it wouldn’t surprise me at all when Middlesex bat a second time to see Marcus Trescothick down on his knees at second slip again because the ball just isn’t bouncing
Warwickshire 188 v Hampshire 13-3
Captain James Vince is the next Hampshire batsman back in the pavilion as he is trapped in front by Chris Wright.
This is not going to plan for the visitors at Edgbaston.
#bbccricket
Matt: Oh god @hantscricket, external, not again #bbccricket
Warwickshire 188 v Hampshire 8-2
This relegation scrap is going to go down to the wire with all three of Hampshire, Middlesex and Somerset!
The visitors lose their second wicket as Ryan Sidebottom bowls Jimmy Adams at Edgbaston.
If Hampshire can makes at least 350 runs in their first innings against Warwickshire they will secure their Division One status, regardless of the result at Taunton, but that is not looking like a simple task at the moment!
A draw is also good enough.
In Division One Lancashire captain Steven Croft is on 91 not out and has helped his side to 227-7 against Surrey. They lead by 26.
Unbeaten champions Essex are 34-2 in their second innings against Yorkshire, leading by 150, with Nick Browne and Dan Lawrence at the crease.
Image source, Rex FeaturesIn Division Two, Derbyshire batsman Wayne Madsen passed 10,000 first-class runs in his innings of 121.
Alex Hughes is unbeaten on 129 with Derbyshire on 350-4 against Gloucestershire.
Kent bowled Glamorgan out for 229 and are 11-0 in their second innings - a lead of 84.
Sussex 565 v Nottinghamshire 2-1
Jake Libby departs for a duck as he is caught off Jofra Archer just 10 balls into Notts' innings.
Is there going to be a shock in the Division Two promotion race?
Northants are 73-0 at Leicestershire and just 55 behind.
Somerset 236 & 86-3 v Middlesex 142
Image source, Rex FeaturesJames Hildreth makes batting look so easy at times.
The 33-year-old moves to 38 with a beautiful clip through mid-wicket for four.
Somerset's lead is 180 - they may have enough already on a turning pitch.
Warwickshire 188 v Hampshire 5-1
Hampshire lose an early wicket as Tom Alsop is trapped lbw by Australian seamer Ryan Sidebottom.
The visitors need to make at least 350 runs inside 110 overs of their first innings to secure their Division One status.
A draw will also do the job no matter how many runs they score.
Worcestershire 335 v Durham 0-0
Keaton Jennings and Cameron Steel come to the crease for Durham.
Jennings is playing his final game for the county - the England batsman announced he is joining Lancashire next season, earlier today.
Nine wickets for Worcestershire inside 110 overs seals their promotion.
Kent 302 & 6-0 v Glamorgan 229
Nick Webb
BBC Wales Sport
Kent's first-innings advantage of 73 was fewer than looked likely this morning as Glamorgan's lower order fought their way up from 65-5 to 229 all out.
Chris Cooke with 49, Craig Meschede with 44 and Ruaidhri Smith with 36 all made useful runs without matching the decisive knock of Joe Denly, who made 152 on day one.
Callum Haggett took 3-40 in an accurate display of seam bowling under cloudy skies, while there were two wickets apiece for the pacy Adam Milne, the wily Darren Stevens and newcomer Grant Stewart.
But Glamorgan did not have enough wickets in hand to benefit from the easing of conditions in the afternoon.
Worcestershire 335 v Durham
Martin Emmerson
BBC Newcastle
The hosts have managed to gain three of the six points they need for promotion at New Road, with every run eagerly applauded by the home faithful.
They were eventually out for 335 with Ed Barnard's dismissal bring tea. He made a career-best 75 before he was bowled by Mark Wood, who in doing so got his first wicket of the game.
Barnard and Ravichandran Ashwin added 86 for the seventh wicket with Ashwin making 82 before he fell lbw to give debutant Liam Trevaskis his first wicket in first-class cricket.
Graham Onions finished with 4-68 in his final game for Durham before he heads off for a two-year contract elsewhere, with reports suggesting he will be joining team-mate Keaton Jennings at Lancashire next season.
Jennings' departure was confirmed this morning but a few hours later BBC Newcastle learned Will Smith is returning to Chester-le-Street next season after four years at Hampshire.
The 34-year-old won three county titles and a one day cup with Durham and will add experience to the middle order at a club desperate for some good news following a string of high profile departures in the wake of ECB sanctions.
Sussex 565 v Nottinghamshire
Adrian Harms
Sports reporter, BBC Sussex
A tremendous day for Sussex who have added 335 runs today with career-best scores of 146 from Michael Burgess and 147 from Chris Jordan, and just to rub salt in the wounds a rapid 72 from Jofra Archer as Sussex were finally dismissed for 565.
Notts will take comfort from the fact that this looks a good batting track and in the knowledge that a full haul of batting points and a draw will be enough to secure promotion.
Anything less however and the long term Division Two leaders will be anxiously watching developments at Leicester.
Somerset 236 & 73-3 v Middlesex 142
The most important session in these two sides' season begins.
If Somerset bat well and push their lead up towards 250 and beyond, they'll be huge favourites for victory.
Middlesex will still hope they can chase 200 or 220, but the lead is already up to 168.
Image source, Getty Images#bbccricket
Tim O'Hare: Am I right in thinking that with 3 bowling points already bagged Hampshire are now safe if they draw? Come on @SomersetCCC, external...
Spot on Tim. Middlesex are in real danger.
And breathe!
It wasn't quite as frantic as the morning session, but there were still plenty of twists and turns.
Grab a cuppa, strap in for the final couple of hours after tea.
Division One
Essex 227 & 24-2 v Yorkshire 111 (Chelmsford)
Surrey 201-8 dec v Lancashire 222-7 (Old Trafford)
Somerset 236 & 70-3 v Middlesex 127-8 (Taunton)
Warwickshire 188 v Hampshire (Edgbaston)
Division Two
Gloucestershire v Derbyshire 346-4 (Bristol)
Kent 302 v Glamorgan 229 (Canterbury)
Leicestershire 128 v Northamptonshire 65-0 (Grace Road)
Sussex 565 v Nottinghamshire (Hove)
Worcestershire 335 v Durham (New Road)